It's safe to drive a 91 4Runner in H4 gear in the Highway?

It really depends on how fast your going. If your in bumper to bumper traffic, then sure why not. If your cruisin' 60-70 MPH then no way. Your just askin for trouble. FYI, in case no one told you, runnin in high four is gonna use more gas than high two. -SCRAIG